var FW_phone_field_length=0;
function FW_next_field(obj,event,len,next_field) {
	if (event == "down") {
			FW_phone_field_length=obj.value.length;
		}
		else if (event == "up") {
		if (obj.value.length != FW_phone_field_length) {
			FW_phone_field_length=obj.value.length;
			if (FW_phone_field_length == len) {
					document.getElementById(next_field).focus();
					document.getElementById(next_field).select();
			}
		}
	}
}